Re: [PATCH v5] pseries: prevent free CPU ids to be reused on another node

[Laurent Dufour]

Le 03/08/2021 à 18:54, Nathan Lynch a écrit :
> Laurent Dufour <ldufour@xxxxxxxxxxxxx> writes:
> > V5:
> >   - Rework code structure
> >   - Reintroduce the capability to reuse other node's ids.
>
> OK. While I preferred v4, where we would fail an add rather than allow
> CPU IDs to appear to "travel" between nodes, this change is a net
> improvement.
>
> Reviewed-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx>

Thanks Nathan,

Regarding the reuse of other nodes free CPU ids, with this patch the kernel does 
it best to prevent that. Instead of failing adding new CPUs, I think it's better 
to reuse free CPU ids of other nodes, otherwise, only a reboot would allow the 
CPU adding operation to succeed.

Laurent.